Air source heat pump defrosting device
By using a mechanical transmission system to drive the electric heating components to rise and fall, combined with temperature sensor control, the frost problem of air source heat pumps is solved, achieving low-energy and high-efficiency defrosting, and improving defrosting efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-10
AI Technical Summary
Existing electric defrosting methods are energy-intensive and have low heat utilization efficiency, and cannot effectively solve the frost problem of air source heat pumps in low-temperature environments.
A mechanical transmission system drives the electric heating element to rise and fall, combined with temperature sensor control, to achieve defrosting by heating the electric heating element from top to bottom, and to accelerate the melting of frost by using heat convection. Efficient defrosting is achieved through the synergistic effect of mechanical and thermal forces.
It achieves low-energy and high-efficiency defrosting, improves the defrosting efficiency and stability of air source heat pumps, and reduces operating costs.
Smart Images
Figure CN223985411U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of heat pump defrosting technology, specifically relating to an air source heat pump defrosting device. Background Technology
[0002] As a modern, highly efficient, and energy-saving heating and cooling device, air source heat pumps are prone to frost formation on the fins of their heat exchangers when operating in low-temperature environments. Frost formation not only reduces heat exchange efficiency, leading to a decline in the performance of the heat pump system, but can also increase energy consumption and even cause equipment failure, severely affecting its stability and service life. To address this issue, traditional defrosting methods mainly include electric defrosting, reverse circulation defrosting, and natural melting defrosting.
[0003] Electric defrosting is a relatively direct and widely used defrosting method. Its principle involves installing electric heating elements near or on the surface of the heat pump fins. When the ambient temperature drops below a preset frosting temperature, the control unit activates the heating elements, using the heat generated to directly melt the frost on the fins. However, electric defrosting has significant energy consumption issues. On one hand, the heating elements consume a large amount of electricity during operation, especially during prolonged or frequent defrosting, which significantly increases the operating costs of the heat pump system. On the other hand, the heat generated during electric defrosting is often not fully utilized, with some heat dissipated into the air, resulting in low energy efficiency. Utility Model Content
[0004] To address the above problems, the purpose of this utility model is to provide an air source heat pump defrosting device that solves the problems of high energy consumption and inability to fully utilize the generated heat energy in the existing electric defrosting method for cleaning the outdoor unit of the air source heat pump.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: an air source heat pump defrosting device, comprising an outer casing, inside which a heat pump outdoor unit is placed. A ventilation slot is provided through the outer casing on the fins and fan side of the heat pump outdoor unit. A controller, a motor, and a temperature sensor are installed on the outer casing. The motor drives a lead screw in a lifting assembly. There are multiple lead screws, and each lead screw is rotatably mounted on a bearing seat. The bearing seat is installed in the outer casing surrounding the heat pump outdoor unit. A pulley is installed on the lead screw, and a transmission belt connects the multiple pulleys. A lifting frame is installed on the nut of the lead screw, and an electric heating component is installed on the lifting frame. The electric heating component is located on one side of the fins of the heat pump outdoor unit.
[0006] The beneficial effects of this utility model are as follows: by controlling the lifting and energizing of the electric heating component and combining it with the mechanical transmission system, the heat pump outdoor unit fins are heated and defrosted from top to bottom. At the same time, the water formed by the defrosting above flows downward to melt the frost below, thereby achieving a high-efficiency defrosting effect with low power consumption.
[0007] To ensure the stability of the lead screw rotation;
[0008] As a further improvement to the above technical solution: a fixing plate is installed on the top of the outer shell, and the top end of the lead screw is rotatably installed in the fixing plate.
[0009] The beneficial effect of this improvement is that the fixed plate, together with the bearing housing, provides stable rotational support for the lead screw.
[0010] To ensure the stability of the lifting and moving of the lifting frame;
[0011] As a further improvement to the above technical solution: the lifting frame has a square frame structure and is installed on the outside of the heat pump outdoor unit.
[0012] The beneficial effect of this improvement is that the lifting frame can be stably raised and lowered on the outside of the heat pump outdoor unit under the drive of the nuts of multiple lead screws.
[0013] In order to effectively heat and remove frost from the fins of the heat pump's outdoor unit;
[0014] As a further improvement to the above technical solution: the electric heating component includes a support frame, which is a square frame structure, and an electric heating tube is installed inside the support frame.
[0015] The beneficial effects of this improvement are as follows: after being powered on, the electric heating tube directly heats the fins of the heat pump outdoor unit at the adjacent height through thermal radiation. At the same time, the fan on the heat pump outdoor unit can draw in outside air during operation and let it flow over the surface of the electric heating tube, using thermal convection to further heat the fins and improve defrosting efficiency.
[0016] To enable automatic defrosting of the device;
[0017] As a further improvement to the above technical solution: a temperature sensor is installed inside the outer casing, and the controller is electrically connected to the motor, the temperature sensor and the heating element.
[0018] The beneficial effect of this improvement is that when the temperature sensor detects that the ambient temperature has reached the frosting temperature, the controller controls the motor and heating element to be powered on to carry out the defrosting work.
[0019] In order to achieve automatic adjustment and control of the position of the electric heating element;
[0020] As a further improvement to the above technical solution: micro switches are installed on the outer shells on both the upper and lower sides of the lifting frame, the contacts of the micro switches are oriented towards the lifting frame, and the micro switches are electrically connected to the controller.
[0021] The beneficial effects of this improvement are as follows: after the lifting frame moves down and presses the contact of the micro switch below, the controller controls the heating element to be de-energized. At the same time, the motor reverses and drives the lifting frame to move up, so that after the lifting frame presses the contact of the micro switch above, the motor is de-energized and the defrosting work is completed.
[0022] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;
[0024] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;
[0025] Figure 3 This is a schematic diagram of the structure of this utility model excluding the heat pump outdoor unit;
[0026] In the diagram: 1. Outer casing; 2. Heat pump outdoor unit; 3. Ventilation slot; 4. Controller; 5. Motor; 6. Temperature sensor; 7. Lifting assembly; 71. Lead screw; 72. Bearing seat; 73. Pulley; 74. Transmission belt; 75. Fixing plate; 76. Micro switch; 8. Lifting frame; 9. Heating assembly; 91. Support frame; 92. Heating tube. Detailed Implementation
[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.
[0028] Example 1:
[0029] like Figure 1As shown in Figure 3: An air source heat pump defrosting device includes a housing 1, inside which a heat pump outdoor unit 2 is placed. A ventilation slot 3 is formed through the fins and fan side of the heat pump outdoor unit 2 on the housing 1. A controller 4, a motor 5, and a temperature sensor 6 are installed on the housing 1. The motor 5 drives a lead screw 71 connected to a lifting assembly 7. There are multiple lead screws 71 (four in this example), located at the four corners of the housing 1. Each lead screw 71 is rotatably mounted on a bearing seat 72, which is installed inside the housing 1 surrounding the heat pump outdoor unit 2. Each lead screw 71 has a pulley 73 mounted at the same height. A transmission belt 74 is fitted between the pulleys 73. A lifting frame 8 is installed on the nut of the lead screw 71 above the transmission belt 74. An electric heating component 9 is installed on the lifting frame 8. The electric heating component 9 is located on one side of the fins of the heat pump outdoor unit 2. By controlling the lifting and energizing of the electric heating component 9, combined with the mechanical transmission system, the fins of the heat pump outdoor unit 2 are heated and defrosted from top to bottom. At the same time, the water formed by the defrosting above flows downward to melt the frost below, thereby achieving a high-efficiency defrosting effect with low power consumption. A fixing plate 75 is installed on the top of the outer casing 1. The top end of the lead screw 71 is rotatably installed in the fixing plate 75. The fixing plate 75, together with the bearing seat 72, provides support for the lead screw 71. A stable rotating support is provided. The lifting frame 8 has a square frame structure and is located on the outside of the heat pump outdoor unit 2. Driven by the nuts of multiple lead screws 71, the lifting frame 8 rises and falls stably on the outside of the heat pump outdoor unit 2. The electric heating component 9 includes a support frame 91, which has a square frame structure. An electric heating tube 92 is installed inside the support frame 91. When energized, the electric heating tube 92 directly heats the fins of the heat pump outdoor unit 2 at adjacent heights through thermal radiation. At the same time, the fan on the heat pump outdoor unit 2 can draw in outside air during operation and let it flow over the surface of the electric heating tube 92, using heat convection to further heat the fins and improve defrosting efficiency. A temperature sensor is installed inside the outer casing 1. The controller 4 is electrically connected to the motor 5, the temperature sensor 6, and the heating element 92. When the temperature sensor 6 detects that the ambient temperature has reached the frosting temperature, the controller 4 controls the motor 5 and the heating element 92 to be powered on for defrosting. Microswitches 76 are installed on the outer shell 1 on both the upper and lower sides of the lifting frame 8. The contacts of the microswitches 76 are set facing the lifting frame 8. The microswitches 76 are electrically connected to the controller 4. After the lifting frame 8 moves down and touches the contact of the lower microswitches 76, the controller 4 controls the heating element 92 to be de-energized. At the same time, the motor 5 reverses and drives the lifting frame 8 to move up. After the lifting frame 8 touches the contact of the upper microswitches 76, the motor 5 is de-energized to complete the defrosting work.
[0030] The working principle of this technical solution is as follows: When the temperature sensor 6 detects that the ambient temperature has reached the frosting temperature, the controller 4 controls the heating element 92 to be energized. At the same time, the motor 5 drives a lead screw 71 to rotate. The pulley 73 mounted on the rotating lead screw 71 drives the transmission belt 74 to rotate, which in turn causes the other pulleys 73 to drive the lead screw 71 to rotate synchronously. When multiple lead screws 71 rotate synchronously, the nut of the lead screw 71 drives the lifting frame 8 to move down steadily, thereby allowing the energized heating element 92 to heat the fins on the heat pump outdoor unit 2 at the adjacent height through heat radiation. Furthermore, when the fan of the heat pump outdoor unit 2... During operation, outside air can be heated as it flows over the surface of the heating element 92, thereby heating the fins through heat convection. As the motor 5 slowly rotates, the heating element 9 defrosts the fins of the heat pump outdoor unit 2 from top to bottom, causing the heated and melted water to flow downwards under gravity. The hot water generated after defrosting effectively defrosts the surface of the fins. When the lifting frame 8 touches the contact of the micro switch 76 below, the controller 4 controls the motor 5 to reverse, thereby causing the lifting frame 8 to move upwards and reset until it touches the contact of the micro switch 76 above, at which point the power is cut off and the rotation stops.
[0031] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0032] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.
Claims
1. An air source heat pump defrosting apparatus, characterized by: The utility model provides an external heat pump, which comprises an outer shell (1), a heat pump outer machine (2) is placed in the inner portion of the outer shell (1), a ventilation groove (3) is formed through the outer shell (1) on the fin and fan side of the heat pump outer machine (2), a controller (4), a motor (5) and a temperature sensor (6) are installed on the outer shell (1), the motor (5) is drivingly connected to a lead screw (71) in a lifting assembly (7), the number of the lead screw (71) is multiple, the lead screw (71) is rotatably installed on a bearing seat (72), the bearing seat (72) is installed in the outer shell (1) on the side of the heat pump outer machine (2), a belt wheel (73) is installed on the lead screw (71), a transmission belt (74) is sleeved and connected in drive between multiple belt wheels (73), a lifting frame (8) is installed on the nut of the lead screw (71), an electric heating assembly (9) is installed on the lifting frame (8), and the electric heating assembly (9) is arranged on one side of the fin of the heat pump outer machine (2).
2. An air source heat pump defrosting device according to claim 1, characterised in that: A fixed plate (75) is installed on the top of the outer shell (1), and the top end of the lead screw (71) is rotatably installed in the fixed plate (75).
3. An air source heat pump defrosting device according to claim 1, wherein: The lifting frame (8) is a square box structure, and the lifting frame (8) is arranged outside the heat pump outer machine (2).
4. An air source heat pump defrosting device according to claim 1, wherein: The electric heating assembly (9) comprises a support frame (91), the support frame (91) is a square box structure, and an electric heating pipe (92) is installed in the support frame (91).
5. An air source heat pump defrosting device according to claim 1, wherein: A temperature sensor (6) is installed in the outer shell (1), and the controller (4) is electrically connected to the motor (5), the temperature sensor (6) and the electric heating pipe (92).
6. An air source heat pump defrosting device according to claim 1, wherein: A temperature sensor (6) is installed in the outer shell (1), and the controller (4) is electrically connected to the motor (5), the temperature sensor (6) and the electric heating pipe (92).